Drawing board



Nov. 17, 1925- 1,562,208

f E. L. DRINKWATER ET AL DRAWING BOARD Filed June 26, 1924 Patented Nov.17, 1925.

UNITED STATE-S- ])AVISON ASSIG'NOR T0 SAID DRlNKWATER.

DRAWNG BOARD.

Application filed .Tune 26, 1924. Serial No. 722,573.

To all whom t may concern:

Be it known that we, EDGAR L. DRINK- wA'rnR and GEORGE C. DAvisoN,residing at Chicago, in the county of Cook and State of Illinois,respectively, have invented certain improvements in Drawing Boards, ofwhich the following is a specification.

Our invention relates to tackless drawing l boards and is particularlyadapted to the smaller boards of sizes up to approximately i9 X 27 @neof the objects of our invention is to provide a drawing board of thevtype having a frame with paper retaining means extending over theinterior edges of the frame and overlying a movable panel normallyengaging the retaining means, the retaining means being so arranged thattwo interior edges of the frame are unrestricted so as to enable thedrawing sheet to be inserted from above the frame, one end at a time,between the edges of the panel and -the retaining means. i

Another object of the invention is to provide a drawing board of thetype above referred to in which the end portions of the.

panel may be flexibly depressed from engagement with the retaining meansto permit the insertion of the sheet, the center portion of the panel,however, being Xed with respect to the working face of the frame so asto present a substantially rigid drawing surface.

Other and further objects of the inven" tion will more fully hereinafterappear. For drawing boards holding standard size sheets say l0 X 15,such as are used in preparing a Patent Ofce drawing, we have found theconstruction shown very desirable.

Our invention will be more fully understood by reference to theaccompanying drawing which shows a preferred forni of the device and inwhich Figure l is a plan view of a panel drawing-board showing ourimproved construction.

Fig. 2 is a longitudinal section taken on line 2--2 of Fig. l. l

Fig. 3 is a view similar to Fig. 2, but showing a modified construction,in which only a single panel is used.

Fig. 4L is an enlarged fragmentary view of the construction shown inFig. 2.

Fig. 5 is an enlarged fragmentary view of the construction shown in Fig.3.'

and'inortised to form rigid corner'joints.U

Flush metal retaining plates 5 are provided and lower surfaces oftheframe so as to f 1,562,208 PATENT OFFICE.

EDGAR, I.. DRINKWATER AND GEORGEl o. Davison, or'oHIoAGo,-1LLINoIs;sAIns at each corner vof vtheA frame, these retainingn plates, in theform of theV invention shown: in Fig. 2, being arrangedon both the upper'v overlie and underlie the panel opening ,for

'the purpose of supporting and limiting 'the'r panel movement.lfdesire'd, additional retaining plates, suoh as 5a, may be similarlyarranged at the ends of the frame aslshown in Fig. l. The retainingplates a'serve as clips to hold the drawing paper in placek A* upon thepanel 2. Y Asv shownin Fig. 2, and also as indicated in dotted lines inFig. 1, each 'of the panels 2 is recessed or countersunk at suitable npoints so that springs 7 may be inserted in the countersunk portionsto'supply pressure for holding the panels 2 apart and in contact withthe plates -a. Preferably, the

springs 7 will be located at the cornersof the panels and, in caseadditional retaining plates, suchl as 5a, are provided, springs may talso be positioned near the edges of the panels underlying suchretaining plates. With the springs 7 thus arranged, the panels 2-42 aresupported from each other, and spring pressure is maintained between theworking surfaces of both panels andthe retaining plates 5-5a. Bothpanels may be used for drawing.A 1 n The ends ofthe spring 7 may, ifdesired, be set in depressions or flanged metal kcup receptacles 7 a inthe panels 2-'2 as indicated in detail in Fig. a. Theseflangedreceptacles 7a liold the spring 7 in position and also preventthe springs from pushing off the outer layer of veneer when a veneeredpanel is used. The receptacles 7 a further provide a 'recess in whichthe coil spring 7 compresses without crushing, and thereby allows thepanels 2-2 to be depressed closely back to back, thus gaining the spaceotherwise occupied by the compressed springv for additional capacitywhen Ait is desiredrto carry reserve sheets of paper'. Y

As shown in Fig. 4, theplates 5-59 on either'surface of the frame aresuitably apertured and countersunk to receive malefand through andfirmly reinforce the joint when used as corner plates. Regular woodscrews may also serve for securing the retaining plates on the framewhenv desired.

While in our drawings we have shown retaining plates 5 5 at the fourcorners of the board and between the corners, as shown at 5a 5a, it iswholly within the scope of the invention to use any combination ofplates that may be found advantageous. F or example, it is not requiredthat the retaining plates 5 5 be positioned at the corners of the panelopening, although this is a desirable construction. The retaining platesmay be placed with equal advantage intermediate the corners, overlyingand underlying opposite sides of the panel opening. Neither is itnecessary for successful operation that the plates of the tworsurfacesof the frame be placed opposite each other, although a desirableconstruction consists in securing them, through the frame, te each otherin p airs, as shown.

The portion of the panel retaining plates 5 5a and '6 6l recessed intothe frame 1 is preferably of circular shape and greater than 180", asshown. This makes it possible to recess the frame in one operation witha bit, to receive the flush plates, and, with a circumference 'ofgreater than 18()O recessed into the frame, the plate is retainedagainst any lateral motion, even though the screw holes through theframe be somewhat larger than the body of the screw.

It is desirable in drafting to keep the surface of the paper flush orslightly lower than kthe T'-'square, and to provide this advantage wehave secured the strips 10 10 supporting the panel at a proper .fixedheight by recessing the strips into saw cuts 11 11 in the sides 3 3 ofthe frame, as shown in Figs. 1 and 2. These strips 10 10 may be of equalservice by attaching them by means of screws 11 11 to the sides 3 3 ofthe frame, as indicated in dotted lines in the lower part of Fig. 1.These supporting strips 10 10 notl only provide a stationary rest forthe panel and oppose warping of the panel, but they also serve as afulcrum upon which the panel may be sprung to insert the paper beneaththe retaining plates 5 5? The omission of these supporting strips forone panel of the double panel board allows the surface of such panel todepress equally at all points, so that reserve sheets of draw-v ingpaper may be carried on such panel for field use.

" The paper, being cut approximately the size but not larger than theopening in the frame, is secured on the board in the following manner:The paper whose edges are indicated kby the dotted lines a, al, a2, anda3 is placed in proper position on the board ready to insert one edge ofthe sheet, as indicated by the dotted line a in Fig. 1, beneath theretaining plates 5 5 at the corresponding corner or side of the frame 1.One edge of the panel 2 is then slightly depressed at 5 5', and at ythesame time the paper is slipped under the retaining plates 5 5, bringingthe edge of the sheet a against the inside edge of the frame whilekeeping the adjacent edge of thersheet al' snugly against thecorresponding adjacent inside edge of the frame. The opposite edge orcorners of the sheet are then inserted beneath the respective retainingplates in a similar manner. It will be observed that by arranging theretaining plates opposite interior edges only of the frame the twointerior side edges of the frame are free and unrestricted, so that theendsof the paper may be separately inserted under'tlie retain-- ingplates from above the frame without bending or lieXing the paper in morethan one direction.

lit is evident that the two edges of the paper a2 and a3 need not fit asaccurately as the edges z c, and preferably the panel is fg to VS largerthan the .standard size sheets to allow for variations either in thecutting` of paper or due to atmospheric conditions. Sheets somewhatsmaller either way than the pane-l size will also be securely held inplace without. additional retaining plates.

ln this way the sheet is held flat, rigidly gripped between the four ormore upper retaining plates, and the panel is easilyfremoved and maybe'readily and accurately replaced. At no point does the surface of thepaper lie above the surface of the frame, preventing rubbingl and thuskeeping the paper clean. Scale and gauge marks may be made on the framefor marginal, center guide lines, etc. The frame is preferably properlysquared from all four sides, thereby makingfour outer working edges. Noend grain is presented to the T-square, and

a frame so constructed will remain true, for l any shrinkage isnecessarily uniform throughout.

A modified arrangement is shown in l? 3 and 5 in which'but a singlepanel 2 is provided. ln this case the retaining plates 5 and 5a (wherethe latter are provided) will only be arranged upon the upper workingface of the frame 1, the side members 3 3 and end members e beingrabbeted as shown at 13 to form a support for the springs 7. Preferably,the rabbets 13 will be recessed or conntersunk so'that when the panel 2is depressed the spring may be come pressed into the recess. rliheretaining plates 5, as Lshown in Figs. 3 and are secured by ordinarywood screws 9. lf desired, the underside of the frame may be coveredvwith felt or other suitable material as indicated at 12 in Figs. 3 and5.

The modification just described possesses the advantages previouslyrecited in Aconnection with the arrangements shown in Figs. 2 and 4tand, in addition, is a somewhat simpler and less expensive construction.It requires a smaller number of retaining plates, and the provision ofthe `rabbeted portion of the members of the frame involves no mechanicaldiificultyA whatever. l

While we have shown herein our preferred construction, we do not wishlto be understood as limiting ourselves vthereto as we realize that manymodifications might be made without departin from the spirit of thisinvention as defined in the following claims.

What is claimed is:

l. n a drawing board, a frame having interior dimensions substantiallycorre spending to a n drawing sheet, retaining means projecting from theface of the frame and over the interior opening thereof near two edgesonly so that the other two interior edges are separated throughsubstantially their entire length by a distance at least equal to thewidth of the sheet, ra panel mounted in said frame, the edges of saidpanel engaging said retaining means and being flexibly heldthereagainst, and a portion of said panel intermediate said edges beingfixed with respect to the working face of` said frame, said panel beingadapted to have said edges pressed away from the retaining means wherebythe sheet may have one edge inserted from above the frame between thepanel and retaining means at one edge of the frame and the opposite edgeof the sheet then inserted from above between the panel and retainingmeans at the opposite edge of the frame.

2. In a drawing board, a frame having interior dimensions substantiallycorresponding to a drawing sheet, retaining means projecting from theface of the frame and over the interior opening thereof near two edgesonly so that the other two interior edges are separated throughsubstantially their entire length by a distance at least equal to thewidth of the sheet, a panel mounted within said frame, spring members toexibly hold two edges of said panel in engagement with said retainingmeans, and means for .tixedly positioning a portion of said panelintermediate of said edges with respect to the working face of theframe, the edges of said panel being adapted to be pressed away from theretaining means whereby the sheet may have one edge inserted from abovethe frame between the panel and retaining means atone edge of the frameand the opposite edge of theV sheet then inserted from above between thepanel and retaining means at the opposite edge of the frame.

3. In a drawing board, a frame having interior dimensions substantiallycorresponding to a drawing sheet, a retaining plate recessed in the faceof the frame 'at each corner thereof and having a portion projectingfrom the interior opening of the frame, the

portion o f said plates recessed in said frame being an arc greater than180 for the pur? frame, the ends of said panel being adapted to bepressed away from the retaining plates whereby the drawing sheet mayhaveone Y edge inserted from above the frame between the panel and retainingplates at two corners of the frame and the opposite edge ofthe sheetthen inserted from above betweenv the panel and retainingplates at theopposite corners of the frame. n

4. In a drawing board, a frame having interior dimensions substantiallysponding to a drawing sheet, retaining means projecting from each faceof the frame and over the interior opening there! of near two edges onlyso that the other two interior .edges are separated throughsubstantially their entire length by a distance at least equal to thewidth of the sheet, a pair -of panels mounted within said frame, saidpanels being maintained in spaced relationship and having their endsflexibly held against said retaining means so that they may be pressedaway from the retaining means, means to fix a portion of said panelsintermediate its ends with respect to the working face of said frame,whereby the sheet may have one edge insertedfrom above the frame betweentheA panel and retaining means at one edge of the frame and the oppositeedge of the sheet then inserted from above between the panel andretaining means at the opposite edge of the frame.

, 5, In a drawing board, a frame having interior dimensionssubstantially corresponding to a'drawing sheet, retaining meansprojecting from the face of the frame and over the interior openingthereof near two edges only so that the other two interior edges areseparated through substantially.

their entire length by a distance at least v the frame and the oppositeedge of the sheet then inserted from above between the panel andretainingl means at the opposite edge ot' the frame. v

G. ln a drawing board, a traine yhaving interior dimensionssubstantially correspendingl to a drawing sheet, retaininfcl meansprojecting frein each Jrace of the traine and over the interior openingthere of near two edges only so that the other two interior edges areseparated through substantially their entire length by a distance atleast equal to the width ot' the sheet5 a pair olf panes mounted Withinsaid traine? 'two edges of each el" said panels being fienibly heldk inspaced relationship land against the corresponding retainii'lgjV ineens,and a portionA ofi one of said'panels between said edges belng lixedwith respect to the working face ot' the frame, sald panels being eadapted to be pressed away from the retaining plates whereby the drawingsheet may have one edge inserted from above the traine between the paneland retaining plates at two corners of the frame and the Opposite edgeot the sheet then inserted from above between the panel and retainingplates at Jthe opposite corners of the frame.

ln testimony whereof, We have signed our naines to this specificationthis 24th day of June, 1.924%.

EDGAR L; DRNKVATER. GEBGE C. DAVISON.

